help me

I've been playing Chrono Cross for a long time now. And I got up to the Earth Dragon battle, beat the boss... and the game just stops. It'll still go, i can pause... the people and enemy in battle still moves... the music plays fine... but... it wont end the battle... i cant choose to attack or nothing cuz its dead... the body wont fall to rghe ground... it just acts like nothings wrong... it will not move from that spot... it just sits there.... i've sat for hours... i cleaned the disc... it wont work... and its just this spot... so far... please help.